Biodegradable set retarder for a cement composition

Abstract

Compositions and methods are directed to a cement composition for use in a subterranean formation. In an embodiment the cement composition comprises: (A) cement; (B) water; and (C) a polymer, wherein the polymer: (i) consists essentially of a monomer or monomers selected from the group consisting of acrylic acid, esters of acrylic acid, maleic acid, methacrylic acid, esters of methacrylic acid, itaconic acid, fumeric acid, citraconic acid, mesoconic acid, and any alkali metal, alkaline earth metal, or ammonium salt of any of the foregoing, and any combination of any of the foregoing.

What is claimed is: 
     
       1. A cement composition for use in a subterranean formation, the cement composition comprising:
 (A) cement; 
 (B) water; and 
 (C) a polymer, wherein the polymer:
 (i) consists essentially of a monomer or monomers selected from the group consisting of, esters of acrylic acid, maleic acid, methacrylic acid, esters of methacrylic acid, itaconic acid, fumeric acid, citraconic acid, mesoconic acid, and any alkali metal, alkaline earth metal, or ammonium salt of any of the foregoing, and any combination of any of the foregoing, wherein the monomer or monomers are not grafted to a polymer backbone; 
 (ii) has the following characteristics:
 (a) is water soluble; and 
 (b) is biodegradable; and 
 
 (iii) is capable of providing:
 (a) a thickening time of at least 2 hours for a test composition maintained under a temperature condition of 190° F. and a pressure of 5,160 psi; and 
 (b) an initial setting time of less than 24 hours for the test composition maintained under a temperature condition of 217° F. and a pressure of 3,000 psi, 
 wherein the test composition consists of 860 grams of Class-H Portland cement, 325 grams of deionized water, and 0.4% by weight of the cement of the polymer. 
 
 
 
     
     
       2. The cement composition according to  claim 1 , wherein the cement is selected from the group consisting of Class A cement, Class C cement, Class G cement, and Class H cement. 
     
     
       3. The cement composition according to  claim 1 , wherein the water is selected from the group consisting of freshwater, brackish water, saltwater, and brine, in any combination thereof in any proportion. 
     
     
       4. The cement composition according to  claim 1 , wherein the cement composition has a density in the range of about 9 to about 22 pounds per gallon (ppg). 
     
     
       5. The cement composition according to  claim 1 , wherein the polymer is a homopolymer, and the monomer is selected from the group consisting of maleic anhydride, itaconic acid, and methacrylic acid. 
     
     
       6. The cement composition according to  claim 1 , wherein the polymer is a copolymer, and wherein one of the monomers is acrylic acid, and the other monomer is selected from maleic anhydride, acrylamide, methacrylic acid, or butyl acrylate, in any proportion. 
     
     
       7. The cement composition according to  claim 1 , wherein the polymer is in at least a sufficient concentration such that the cement composition has a thickening time of at least 3 hours maintained under a temperature condition of 217° F. and a pressure of 10,200 psi. 
     
     
       8. The cement composition according to  claim 1 , wherein the polymer is in a concentration equal to or less than a sufficient concentration such that the cement composition sets in less than 48 hours maintained under a temperature condition of 217° F. and a pressure of 3,000 psi. 
     
     
       9. The cement composition according to  claim 1 , wherein the polymer is in a concentration in the range of about 0.05% to about 10% by weight of the cement. 
     
     
       10. The cement composition according to  claim 1 , wherein the polymer is in a concentration in the range of about 0.1% to about 2% by weight of the cement. 
     
     
       11. The cement composition according to  claim 1 , wherein the polymer has an average molecular weight in the range of about 500 to about 5,000. 
     
     
       12. The cement composition according to  claim 1 , wherein the polymer has an average molecular weight in the range of about 600 to about 3,500. 
     
     
       13. The cement composition according to  claim 1 , wherein the polymer has an average molecular weight in the range of about 800 to about 2,000. 
     
     
       14. The cement composition according to  claim 1 , wherein the cement composition has a thickening time of at least 3 hours maintained under a temperature condition of 217° F. and a pressure of 10,200 psi. 
     
     
       15. The cement composition according to  claim 1 , wherein the cement composition has a thickening time in the range of 4 to 10 hours maintained under a temperature condition of 217° F. and a pressure of 10,200 psi. 
     
     
       16. The cement composition according to  claim 1 , wherein the cement composition has a compressive strength of at least 400 psi when tested at 24 hours and maintained under a temperature condition of 217° F. and a pressure of 3,000 psi. 
     
     
       17. The cement composition according to  claim 1 , wherein the cement composition has a compressive strength in the range of 400 to 10,000 psi when tested at 24 hours and maintained under a temperature condition of 217° F. and a pressure of 3,000 psi.